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This letter presents an approach for modular multilevel converters that enables a stable operation with failed nonredundant modules. This is achieved by using a neutral shift with a dedicated power feed-forward control. The feasibility of the approach is verified by simulation.
IGBT modules suffer from ageing due to thermal and power cycling. Bond wire lift-off or solder layer degradation are the known failure mechanisms. For condition monitoring, an estimation of the junction temperature during operation is necessary. For this purpose, an analog measurement board consisting of simple components is presented. The turn-off delay time is evaluated for temperature estimation...
Common-mode voltage (CMV) in inverter-fed electrical machines causes bearing currents and electromagnetic interference affecting the reliability of drive systems. Special modulation methods have been developed to reduce CMV. This paper characterizes unwanted CMV caused by dead time effects during simultaneous switching events in two phases. Theoretical analysis is followed by simulation and validated...
This paper presents a new control method for boost DC/DC converters combined with voltage source inverter systems to minimize the DC-link capacitor-current RMS value. The examined converter system consists of a multi-phase boost converter and a three-phase inverter with common DC-link capacitor. A general analytical expression for the DC-link capacitor-current RMS value is derived, which allows to...
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